CAthodic Protection
CAthodic Protection
(OP)
Hi,
I am currently looking into Cathodic protection of submersed equipment for my employer. In one of the papers i was reading, the following statement is made:
"corrosion occurs at the annode but not at the cathode (unless the metal of the cathode is attacked by Alkali)"
The paper does not go on to explain the effect of Alkali on the cathode, which I assume is because this could make an entire paper in itself.
Can anyone shed light on the effects an Alkali has on the cathode, and why it changes the corrosion on the annode? Or has anyone got any suggestion son where to find information on this?
Regards
Ronny
I am currently looking into Cathodic protection of submersed equipment for my employer. In one of the papers i was reading, the following statement is made:
"corrosion occurs at the annode but not at the cathode (unless the metal of the cathode is attacked by Alkali)"
The paper does not go on to explain the effect of Alkali on the cathode, which I assume is because this could make an entire paper in itself.
Can anyone shed light on the effects an Alkali has on the cathode, and why it changes the corrosion on the annode? Or has anyone got any suggestion son where to find information on this?
Regards
Ronny





RE: CAthodic Protection
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: CAthodic Protection
RE: CAthodic Protection
Steel is protected from corrosion under alkaline conditions which is why CP is widely used. What the paper is saying is that some other metals, notably aluminium, corrode in alkaline conditions. This means that if over-protected or excessively polarised cathodically, they corrode. One has to be careful applying CP to these metals.